The Golden Verses of Pythagoras, by Fabre d'Olivet, [1917], at sacred-texts.com

29. So that, as to thy true rights enlightened, Thine heart shall no more feed on vain desires.

That is to say, that the disciple of Pythagoras, having attained through knowledge of himself to that of truth, ought to judge sanely of the possibility or impossibility of things, and to find in wisdom itself that just mean which he has found in virtue and in science. Equally distant from that blind credulity which admits and seeks without reflection the things most incompatible with the laws of Nature, and from that presumptuous ignorance which rejects and denies without examination all those things which issue from

the narrow circle of its empirical notions; he should understand with exactness the limits and the forces of Nature, know instantly what is contained therein or what exceeds them, and not form any vow, any project, or any enterprise beyond his power.